Flora of North America species comparison

erect to ascending, branched.

creeping, branched, rooting at nodes.

pinnate;

stipules ovate-lanceolate, 0.5–0.8 cm, margins entire, glandular, apex acuminate;

petiole 0.3–2 cm;

lateral leaflet petiolules 0.5–0.6 mm, terminal leaflet stalk 3–5 mm;

leaflets 3, blades rhombic to obovate, 0.4–1.5 × 0.4–0.8 cm, base cuneate, lateral veins prominent, ± parallel, ascending, margins denticulate distally, apex truncate or retuse, surfaces strigose adaxially.

palmate;

stipules ovate-lanceolate, 0.5–1 cm, margins entire, apex acute to acuminate;

petiole 3–10 cm;

petiolules 0.5–1 mm;

leaflets 3, blades obcordate, 0.5–1.8 × 0.5–1.5 cm, base cuneate, veins thickened, margins entire or denticulate distally, apex usually deeply emarginate, rarely rounded, surfaces glabrous.

axillary, 30–60-flowered, globose or broadly ovoid, 0.8–1.5 × 0.7–1 cm;

involucres absent.

axillary, 5–20-flowered, globose, 1–2.2 × 1–20 cm, chasmogamous erect, cleistogamous becoming subterranean;

involucres formed of distinct, narrowly lanceolate bracts, 2.5–3.5 mm.

1.5–3.5 cm.

chasmogamous 6–8 cm, cleistogamous ± sessile.

reflexed, 0.7–1.2 mm;

bracteoles a fringe of red setae.

reflexed in fruit, cleistogamous pushing fruit underground, chasmogamous 1–8 mm, cleistogamous 4–20 mm;

bracteoles lanceolate, 2–4 mm.

4.3–5 mm;

calyx campanulate, strongly bilabiate, 1.3–1.5 mm, glabrous, veins 5, tube 0.3–0.6 mm, lobes unequal, adaxial deltate, very short, lateral and abaxial linear-subulate, each tipped with 1 or 2 stiff hairs, orifice open;

corolla yellow becoming brown, 3.5–6 mm, ribbed, banner persistent, obovate, enveloping other petals, boat-shaped, 4.3–5 × 2.8–3.2 mm, apex broad, acute.

chasmogamous 8–11 mm, cleistogamous 4–5 mm;

calyx campanulate, 3–5 mm, slightly pilose, veins 10, tube 1.5–2 mm, lobes subequal, adaxial pair connate proximally, sometimes nearly entire length, narrowly triangular-subulate, orifice open;

corolla magenta or pink, 7.5–11 mm, banner broadly obovate-elliptic, 5–10 × 5–8 mm, apex rounded, emarginate.

stipitate, oblong, 2–2.5 mm.

stipitate, chasmogamous ellipsoid, cleistogamous ovoid-globose, chasmogamous longitudinally dehiscent, 3–6 mm, cleistogamous indehiscent, 3–6 mm.

1 or 2, yellow, ellipsoid, 1–1.5 mm, smooth, lustrous.

2–6 (chasmogamous), 1–3 (cleistogamous), tan, mitten-shaped, 1.2–1.5 mm, smooth.

= 14.

= 16, 32.